Computer Science
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt.........8k&link_type=abstract
Ph.D. Thesis - Maryland Univ. National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, MD.
Computer Science
Emission Spectra, Microwave Spectra, Solar Activity, Solar Spectra, Spectrum Analysis, X Ray Spectra, Bremsstrahlung, Energetic Particles, Oso-5, Solar Flares, Solar Magnetic Field, Spatial Distribution
Scientific paper
Hard X-ray and microwave observations of multiply-impulsive solar bursts, identified in the OSO-5 data were analyzed. Spectra in both frequency ranges were used to determine whether or not the source properties change from peak to peak within individual bursts. Two categories of microwave spectral behavior were identified: those events during which the microwave turnover frequency and spectral shape remain the same from peak to peak, and those during which the turnover frequency and spectral shape change significantly. These categories correspond to two classes of multiply-impulsive bursts: those for which the emission can be characterized by a constant magnetic field and therefore a single source region, in which case the multiplicity may be due to modulation of the emission process; and those in which groups of component spikes appear to originate in regions of different magnetic-field strengths, corresponding to separate source regions which flare sequentially. Examples of the latter type of events are presented. The discrete flaring regions are analyzed and their spatial separations estimated.
Crannell Carol J.
Frost Kenneth J.
Karpen Judith T.
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